/*
   * OMAP Power Management debug routines
   *
   * Copyright (C) 2005 Texas Instruments, Inc.
   * Copyright (C) 2006-2008 Nokia Corporation
   *
   * Written by:
   * Richard Woodruff <r-woodruff2@ti.com>
   * Tony Lindgren
   * Juha Yrjola
   * Amit Kucheria <amit.kucheria@nokia.com>
   * Igor Stoppa <igor.stoppa@nokia.com>
   * Jouni Hogander
   *
   * Based on pm.c for omap2
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/kernel.h>
  #include <linux/sched.h>
  #include <linux/clk.h>
  #include <linux/err.h>
  #include <linux/io.h>
  #include <linux/module.h>
  #include <linux/slab.h>
  
  #include "clock.h"
  #include "powerdomain.h"
  #include "clockdomain.h"
  #include "omap-pm.h"
  
  #include "soc.h"
  #include "cm2xxx_3xxx.h"
  #include "prm2xxx_3xxx.h"
  #include "pm.h"
  
  u32 enable_off_mode;
  
  #ifdef CONFIG_DEBUG_FS
  #include <linux/debugfs.h>
  #include <linux/seq_file.h>
  
  static int pm_dbg_init_done;
  
  static int pm_dbg_init(void);
  
  enum {
  	DEBUG_FILE_COUNTERS = 0,
  	DEBUG_FILE_TIMERS,
  };
  
  static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
  	"OFF",
  	"RET",
  	"INA",
  	"ON"
  };
  
  void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
  {
  	s64 t;
  
  	if (!pm_dbg_init_done)
  		return ;
  
  	/* Update timer for previous state */
  	t = sched_clock();
  
  	pwrdm->state_timer[prev] += t - pwrdm->timer;
  
  	pwrdm->timer = t;
  }
  
  static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
  {
  	struct seq_file *s = (struct seq_file *)user;
  
  	if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
  		strcmp(clkdm->name, "wkup_clkdm") == 0 ||
  		strncmp(clkdm->name, "dpll", 4) == 0)
  		return 0;
  
  	seq_printf(s, "%s->%s (%d)
  ", clkdm->name, clkdm->pwrdm.ptr->name,
  		   clkdm->usecount);
  
  	return 0;
  }
  
  static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
  {
  	struct seq_file *s = (struct seq_file *)user;
  	int i;
  
  	if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
  		strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
  		strncmp(pwrdm->name, "dpll", 4) == 0)
  		return 0;
  
  	if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
  		printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d
  ",
  			pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
  
  	seq_printf(s, "%s (%s)", pwrdm->name,
  			pwrdm_state_names[pwrdm->state]);
  	for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
  		seq_printf(s, ",%s:%d", pwrdm_state_names[i],
  			pwrdm->state_counter[i]);
  
  	seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
  	for (i = 0; i < pwrdm->banks; i++)
  		seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
  				pwrdm->ret_mem_off_counter[i]);
  
  	seq_printf(s, "
  ");
  
  	return 0;
  }
  
  static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
  {
  	struct seq_file *s = (struct seq_file *)user;
  	int i;
  
  	if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
  		strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
  		strncmp(pwrdm->name, "dpll", 4) == 0)
  		return 0;
  
  	pwrdm_state_switch(pwrdm);
  
  	seq_printf(s, "%s (%s)", pwrdm->name,
  		pwrdm_state_names[pwrdm->state]);
  
  	for (i = 0; i < 4; i++)
  		seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
  			pwrdm->state_timer[i]);
  
  	seq_printf(s, "
  ");
  	return 0;
  }
  
  static int pm_dbg_show_counters(struct seq_file *s, void *unused)
  {
  	pwrdm_for_each(pwrdm_dbg_show_counter, s);
  	clkdm_for_each(clkdm_dbg_show_counter, s);
  
  	return 0;
  }
  
  static int pm_dbg_show_timers(struct seq_file *s, void *unused)
  {
  	pwrdm_for_each(pwrdm_dbg_show_timer, s);
  	return 0;
  }
  
  static int pm_dbg_open(struct inode *inode, struct file *file)
  {
  	switch ((int)inode->i_private) {
  	case DEBUG_FILE_COUNTERS:
  		return single_open(file, pm_dbg_show_counters,
  			&inode->i_private);
  	case DEBUG_FILE_TIMERS:
  	default:
  		return single_open(file, pm_dbg_show_timers,
  			&inode->i_private);
  	}
  }
  
  static const struct file_operations debug_fops = {
  	.open           = pm_dbg_open,
  	.read           = seq_read,
  	.llseek         = seq_lseek,
  	.release        = single_release,
  };
  
  static int pwrdm_suspend_get(void *data, u64 *val)
  {
  	int ret = -EINVAL;
  
  	if (cpu_is_omap34xx())
  		ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
  	*val = ret;
  
  	if (ret >= 0)
  		return 0;
  	return *val;
  }
  
  static int pwrdm_suspend_set(void *data, u64 val)
  {
  	if (cpu_is_omap34xx())
  		return omap3_pm_set_suspend_state(
  			(struct powerdomain *)data, (int)val);
  	return -EINVAL;
  }
  
  DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
  			pwrdm_suspend_set, "%llu
  ");
  
  static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
  {
  	int i;
  	s64 t;
  	struct dentry *d;
  
  	t = sched_clock();
  
  	for (i = 0; i < 4; i++)
  		pwrdm->state_timer[i] = 0;
  
  	pwrdm->timer = t;
  
  	if (strncmp(pwrdm->name, "dpll", 4) == 0)
  		return 0;
  
  	d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
  	if (d)
  		(void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
  			(void *)pwrdm, &pwrdm_suspend_fops);
  
  	return 0;
  }
  
  static int option_get(void *data, u64 *val)
  {
  	u32 *option = data;
  
  	*val = *option;
  
  	return 0;
  }
  
  static int option_set(void *data, u64 val)
  {
  	u32 *option = data;
  
  	*option = val;
  
  	if (option == &enable_off_mode) {
  		if (val)
  			omap_pm_enable_off_mode();
  		else
  			omap_pm_disable_off_mode();
  		if (cpu_is_omap34xx())
  			omap3_pm_off_mode_enable(val);
  	}
  
  	return 0;
  }
  
  DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu
  ");
  
  static int __init pm_dbg_init(void)
  {
  	struct dentry *d;
  
  	if (pm_dbg_init_done)
  		return 0;
  
  	d = debugfs_create_dir("pm_debug", NULL);
  	if (!d)
  		return -EINVAL;
  
  	(void) debugfs_create_file("count", S_IRUGO,
  		d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
  	(void) debugfs_create_file("time", S_IRUGO,
  		d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
  
  	pwrdm_for_each(pwrdms_setup, (void *)d);
  
  	(void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
  				   &enable_off_mode, &pm_dbg_option_fops);
  	pm_dbg_init_done = 1;
  
  	return 0;
  }
  omap_arch_initcall(pm_dbg_init);
  
  #endif